1 files changed, 15 insertions, 11 deletions

diff --git a/drivers/usb/serial/kl5kusb105.c b/drivers/usb/serial/kl5kusb105.c
index 90e3216abd1f..55736df7d2f4 100644
--- a/drivers/usb/serial/kl5kusb105.c
+++ b/drivers/usb/serial/kl5kusb105.c
@@ -461,17 +461,21 @@ static void klsi_105_close (struct usb_serial_port *port, struct file *filp)
 
         dbg("%s port %d", __FUNCTION__, port->number);
 
-        /* send READ_OFF */
-        rc = usb_control_msg (port->serial->dev,
-                              usb_sndctrlpipe(port->serial->dev, 0),
-                              KL5KUSB105A_SIO_CONFIGURE,
-                              USB_TYPE_VENDOR | USB_DIR_OUT,
-                              KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
-                              0, /* index */
-                              NULL, 0,
-                              KLSI_TIMEOUT);
-        if (rc < 0)
-                    err("Disabling read failed (error = %d)", rc);
+        mutex_lock(&port->serial->disc_mutex);
+        if (!port->serial->disconnected) {
+                /* send READ_OFF */
+                rc = usb_control_msg (port->serial->dev,
+                                      usb_sndctrlpipe(port->serial->dev, 0),
+                                      KL5KUSB105A_SIO_CONFIGURE,
+                                      USB_TYPE_VENDOR | USB_DIR_OUT,
+                                      KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
+                                      0, /* index */
+                                      NULL, 0,
+                                      KLSI_TIMEOUT);
+                if (rc < 0)
+                        err("Disabling read failed (error = %d)", rc);
+        }
+        mutex_unlock(&port->serial->disc_mutex);
 
         /* shutdown our bulk reads and writes */
         usb_kill_urb(port->write_urb);